There is provided an optical disk drive capable of appropriately effecting
recording and reproducing operations without being affected by offset
values and a laser output value, which are set at startup of the disk
drive, even when changes have arisen in the internal temperature of the
disk drive because of changes in ambient temperature. In an optical disk
drive, a temperature sensor provided on a pickup measures a temperature.
When changes in temperature are greater than a predetermined level, a
focus offset value, a tracking offset value, and a value of laser output
from the pickup are reset.